Complete Buying Guide toHome Theater Receivers

All you need to know before you buy an AV receiver

A great TV picture is not enough for an immersive viewing experience. You need surround sound, and the best way to enjoy it is to invest in a home theater receiver - also known as an AV receiver or surround sound receiver.

AV receivers come in a vast range of models with prices ranging from several hundred dollars to a few thousands. Having an understanding of AV receivers and what to look for when making a purchase is thus essential to avoid costly mistakes while future-proofing your investment.

This buyer's guide explains all one needs to know about AV receivers - from a basic understanding of the supported functionality to features to look for when making a purchase. In the process, we discuss amplifier specs to know what makes a good amplifier, how much amplifier power you need, as well as the dilemma many face when
choosing between 5.1 vs. 7.1 multi-channel systems.

Home Theater Receiver BasicsSurround Receivers and related system components

When it comes to home theater surround sound, you need not only the power amplifiers to drive the different speaker channels, but equally important, the necessary circuitry that switches and decodes the incoming audio signals from the different sources.

These can be your TV, satellite TV decoder, DVD or Blu-ray player, AM/FM Tuner, and anything else you can dream of, from game consoles to iPads and laptop PCs.

The best way for most people to enjoy surround sound is to invest in an AV receiver. This combines all these functions in one.

As one may expect, different A/V receivers vary in supported features and specifications, depending on model and brand. Equally important for the would-be buyer is that prices can range from just a few hundred dollars for entry-level models to a thousand dollars and more for higher-end units. Some of the latest models include network support
and 3D-compatibility; a case in point is the relatively affordable Onkyo TX-NR717 7.2-channel AV receiver picture above. However, what matters most for many
in the market for an AV receiver is the audio power output. Partly the reason is that this is the most quoted spec by product makers and retailers in their efforts to impress.

Yet there are more important issues to consider when buying an AV receiver than just amplifier power. Having an understanding therefore of what actually constitutes an AV receiver, as well as what to look for when making a purchase, is essential to avoid costly mistakes.

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What makes a Home Theater Receiver?

We have already stated that a receiver combines switching, decoding, and amplification in one box. But this is a rather too simplistic way of defining a home theater receiver. The functionality supported by the AV receiver is possibly one of the most complex ever handled by any single system component. This explains why the AV or surround sound
receiver is also one of the most expensive components in any home theater sound setup.

The following explains the different functions in further detail:

1] Amplification: A multi-channel power amplifier is needed to drive the different audio channels supported by the surround sound receiver. The basic receiver comes with 5.1 channel support but most mid-range and higher-end systems come with 7.1 or 7.2 channels.

2] Pre-amp/Signal Conditioning and Switching: The preamplifier provides volume and tone controls and integrated audio/video switching support to select the signal source. This switching function of both the audio and corresponding video source is necessary and is fundamental to the operation of the receiver, thus ensuring that the correct
sound stream accompanies the appropriate video signal. It also explains why the surround sound receivers and home theater receivers are often referred to as AV receivers.

Worth taking note here that the handling of the video component involved more than just a switching function. As we will further explain later on in this article, it may also require video conversion from input to output.

3] Surround Sound Decoding: Coupled with the preamp function is the surround sound decoder which decodes the incoming sound into the different audio channels prior to these being feed to the appropriate power amplifier channels. In most cases, AV receivers also include virtual surround sound decoding to simulate
a virtual soundfield from a stereo source.

4] Tuner: Almost, an integral part of an AV receiver package is the presence of an AM/FM tuner in its basic form while higher-spec models may also include support for Sirius satellite radio, internet radio and more.

All this functionality - integrated in one unit - makes the home theater receiver one of the most complex and expensive system components in a home theater audio setup.

It is no wonder therefore that AV receivers come with what many has defined as the most complicated connection panel present on any home entertainment gear. The picture shown here is that of the Onkyo TX-NR717 rear connection panel; this is a typical example of the connectivity level found on today's home theater receivers.

Many home theater enthusiasts are simply put off by this mass of interconnects but in reality, installing a home theater receiver is no more complicated than installing an HDTV. You see, inputs and outputs on the rear panel are always clearly labeled accordingly; therefore, all it takes is a methodical approach to avoid
mixing up the different inputs and outputs.

A Home Theater Receiver or Separate Components?

A home theater receiver is just one way of getting surround sound. For those looking for the ultimate in home theater audio, a setup based on separate components would probably represent their preferred option. But both options have their pros and cons.

Investing in a home theater receiver represents the cheapest option; it may take even up to a couple of thousand dollars in a separates setup to get all the functionality enclosed within the typical home theater receiver. An AV receiver also eliminates the mass of cables needed to interconnect the preamplifier with the multi-channel
amplifier units as well as the Tuner with the preamplifier. And though less important, the receiver option helps save AV rack space.

The downside of the AV receiver solution is that it is hard for the delicate components within the preamplifier/decoder section to coexist under the same roof of a heavy multi-channel power amplifier while sharing the same power supply. We are not saying that it is impossible and some home theater receivers can do a remarkable job in delivering
a great sound. But in general, performance suffers during peaks as power amplifiers tend to draw much of the available power from the rest of the circuitry.

Last but not least, a home theater receiver would make it difficult to isolate any interference caused by the different functions when these coexist in one unit.

On the other hand, a surround sound solution based on a set of separate components would yield the most flexible way of achieving the desired result.

Opting for a separates solution would generally call for a different component for each of the functions highlighted above - namely the tuner, preamplifier complete with switching and surround sound decoder, and the power amplifiers to drive the different speaker channels. The result is a higher level of performance and higher quality sound
at even higher power levels. This makes the whole separates solution more appealing to audiophiles. However, the main reason for choosing the separates route is the need for higher power - say to fill a large hall, rather than just the desire for cleaner sound.

We said the separates option is most appealing to audiophiles but you really need to properly match all system components as otherwise, you risk ending up with a more expensive solution that is only capable of an inferior result!

If you want to opt for separates, do not mix brands and possibly not even model lineups within the same brand. Definitely, do not mix different amps for the different channels in a multi-channel surround sound setup. You see, most amplifiers react differently when adjusting controls - yielding a sound that is not only of a different volume
but one that may even come with a different tonality. This would make it extremely hard if not impossible to balance out the sound on the different channels when using different amplifier models for the different speaker channels.

However... those who know their job well would definitely be able to get the best performance and cleaner sound from a separates surround sound setup.

What to look for in a Home Theater Receiver

So far, we have only discussed the necessary components to get surround sound - whether through the use of a home theater receiver, or through a set of separate system components.

But what should be your main considerations when choosing your receiver, and what features should you look for when making a surround sound or home theater receiver purchase? We discuss these issues in detail below:

Amplifier Power is not Everything

First and foremost, it is important to have a real understanding of amplifier specs in order to get a better idea of what really makes a good amplifier. When it comes to amplifiers and home theater receivers, many just look at the amplifier power rating - which is important but this spec alone cannot be taken out of contest without evaluating
the rest of the amplifier specifications.

For example, an amplifier rated at 75W/Ch RMS into 8 Ohms at 0.08% THD deliver a much cleaner and better sound than one capable of 100W RMS into 8 Ohms at 2% THD - especially if both support the same signal-to-noise ratio.

In a similar manner, watch out for manufacturers' tricks designed to give the impression of a better product. One common trick in this respect is playing with the speaker load at the amplifier rated power.

We discuss amplifier specs in detail in our article: Understanding Amplifier Specs; in the process, we explain how the different specs relate to an amplifier's ability to deliver adequate audio power and sound quality.

How much Power is Enough?

An equally important issue to consider is how much amplifier power you need.

Audio amplifier power is often a grossly misunderstood term; in particular, many relate the sound loudness directly to amplifier power alone. This is not exactly the case.

Determining the amount of audio amplifier power necessary to match your expected level of loudness or listening pattern, is critical for both an enjoyable listening experience in the home theater, as well as for the safety of both your speakers and amplifier alike.

The required amplifier power has to be seen in the light of both your home theater speakers and the room environment. All three are equally important and need to be taken into account when planning an audio set-up.

Home Theater Receiver Features

Video Support:

Audio specs are the most important thing as they determine the quality and level of the audio output. But there are many other features one should look at when selecting a home theater receiver, in particular when it comes to the video part especially if you plan to switch all your audio/video sources via your AV receiver instead of
just plugging these straight to your TV.

Main issues here relate to both the type of supported video connections that the receiver can switch - say component video, HDMI, composite video, etc., as well as the quantity of each. This indirectly is determined by the receiver's ability to convert one video signal to another - say from composite to component video, or to HDMI - depending
on the type of AV interconnect you will be using with your HDTV.

Some receivers also incorporate the ability to both de-interlace and convert these to a progressive scan format, and to upscale incoming video to 720p or 1080p. This is very much the same as upscaling DVD players but with the functionality incorporated in your AV receiver.

More important is the type of HDMI connectivity and HDMI switching function supported by the receiver. As further explained in our HDMI Cable Guide, HDMI carries both video and audio. However, accessing both the audio and video parts present on the HDMI interconnect depends on the receiver's capability
to access both; some lower-end models simply pass-through the video part on the HDMI when switching between different HDMI sources. Higher-end models generally have the ability to access both for further processing.

A 5.1- or a 7.1-Channel Home Theater Receiver - Which is the right one for you?

Another important consideration when planning a home theater receiver purchase is whether to opt for a 5.1- or a 7.1/7.2- multi-channel audio setup; after all, it is the receiver that has to deliver the audio to the respective speakers.

Both options are perfectly capable of delivering an immersive surround sound experience. However, if you are planning to cross the $400/$500 price mark, a 7.1 AV receiver may be worth considering even if you will be implementing a 5.1 speaker set-up.

Multi-Room Audio, Networking and iPod connectivity

These are additional features one may find on mid-range and premium home theater receivers.

Multi-room or multi-zone/Zone B Audio is a feature which enables a home theater receiver to send a second stereo signal to a separate speaker system installed in a different room. The audio signal for Zone B may be either the same or different from that of the main room. Depending on the supported features
of the home theater receiver, this means that you may be using the DVD player as the source for your main room while the built-in FM tuner incorporated within the home theater receiver will serve as the source for your zone B audio.

Networking, Internet Connectivity and AV streaming/DLNA support are feature that are becoming increasingly popular with home entertainment. It is thus no surprise that these are finding their place on the latest breed of home theater receivers. Typical features include streaming of audio from your networked
PCs and Internet radio, as well as upgrading of the AV receiver firmware straight from the Internet.

iPod Connectivity: iPod compatibility is another popular feature you may be interested in. This is normally provided either through a special adaptor cable or through the use of a docking station.

iPod support on home theater receivers comes in under many different forms. Therefore, check the receiver ability to control the iPod and access the iPod menu via the home theater receiver remote. It is also equally important to check whether you will be able to access both the video and audio on your iPod, or if the receiver will access
the audio part only.